Choosing a high-fidelity polymerase is key when accuracy matters: cloning, sequencing, or any application that cannot afford errors.
Today we'll review some common mistakes when using high-fidelity polymerases.
1. Use PCR conditions designed for Taq
One of the most common mistakes is applying the same thermal conditions used with a conventional Taq polymerase. High-fidelity polymerases like AQ97 often have different requirements, especially regarding annealing temperature and extension time.
Solution: Always consult the manufacturer's recommendations. For example, AQ97 performs optimally with an extension time of 15–30 seconds/kb and an annealing temperature adapted to the hot-start system.
2. Unspecific primer design
High fidelity often comes with increased sensitivity to suboptimal conditions. If the primers aren't well-designed, you can experience low performance or non-specific frequency bands.
Solution: Use up-to-date design tools and ensure you avoid internal or primer complementarities. In the case of AQ97, which is a robust polymerase, a proper design ensures clean amplifications even on complex templates.
3. Omit the activation step in hot-start polymerases
Hot-start polymerases like AQ97 require an initial high-temperature activation step to function correctly. If this step is omitted or not properly adjusted, performance may decrease.
Solution: Includes an initial step of 95°C for 2 minutes to ensure complete enzyme activation.
4. Do not adjust the amount of polymerase to the type of sample
With high-fidelity enzymes, more isn't always better. Excessive concentration can increase nonspecific byproducts.
Solution: Start with the amount recommended by the manufacturer (e.g., 0.5 U per reaction of 50 µL with AQ97) and optimize according to the complexity of your sample.
5. Ignoring fidelity as a key factor in sensitive applications
Sometimes a standard Taq is chosen out of habit or budget, even for applications where errors can compromise the entire experiment.
Solution: For applications like cloning, site-directed mutagenesis, or sequencing, invest in a high-fidelity enzyme like AQ97 , which has a 50-fold lower error rate than standard Taq. In the long run, you save time and resources.
Why can AQ97 help you avoid these mistakes?
Ampliqon's AQ97 High Fidelity DNA Polymerase has been designed to offer:
- High fidelity (error rate 1.6 × 10⁻⁶)
- Amplification of long fragments (up to 19.8 kb)
- Robustness in tough templates
- Hot-start system that minimizes non-specific amplifications
Furthermore, its ready-to-use formulation and optimized buffer make it easier to avoid many of these errors without the need for complex adjustments.
Working with high-fidelity polymerases requires some fine-tuning, but with the right approach, you can harness their full potential. If you're tired of failed PCRs or obtaining clones with errors, perhaps it's time to try something else.
Want to try AQ97 in your lab? Write to us and we'll help you find the best solution for your needs.
If you're looking for high-quality options for your research, check out our 20% discount on Ampliqon polymerases , designed to offer you the best in precision and reliability. Don't hesitate to contact us for more information and to take advantage of this offer.
